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size. Next, drill and tap 0-80 in two small brass blocks. Thread the rods into the blocks, then file'the blocks to size as shown in Fig. 2 Part 2, Feb. MR. Drill the holes with a No. 60 bit, then thread with a 00-90 tap. Remove the motor coupling and the worm from the gearbox. Assemble the valve gear, adding one piece at a time and alternating from one side to the other. Check the mechanism on the track from time to time. Be sure there are 'no binds. Draw up the screws only enough to prevent wobbling. You'll probably find it easier to as- semble the valve gear by starting with the drop arms. The crosshead links go outside the drop arms and the combination lever; radius rods are inside the combination levers and reverse links; and the eccentric rods are outside the reverse links and the eccentric cranks. (The offset bend in the cranks may need a little adjustment to make the eccentric rods line up parallel with the frame.) The return cranks must be posi- tioned very accurately. Turn the drivers so that the counterweights are at top dead center. Set the cranks so that they are in line with the first spoke ahead of center under the counterweight. This may not be the precise angle of the prototype, but it is close enough. Rotate the wheels slotly by hand and observe the action of the valve gear. Check for interference between the eccentric rod and return crank. There should be about 164" clearance Fig. 2 1/16" dia. drill rod \ 1 1-1/16" ROD 2 REQUIRED Drill to fit HO truck bushing 1/16" TEMPLATE FOR MAKING TAPERED SECTION OF BOILER No. 60 drill, :ap 00-90 0-80 thread 117 3/32" 517 Drill 1.25 mm.. tap 0-80, 1/16" deep -1 11/8.-1- •ROD END ile/ 2 REQUIRED No. 60 oil hole 5/8" 042042042042•••••a Air/•3/•/,4 1/4" L I i•:illsts-t..2.i•I »/ i/1VMEA- 91 Location 5/8'<lu'VJof screws •-5/8.-IA PILOT TRUCK FRAME LI, Scrap brass 1/4,042 t.\U« PILOT TRUCK BEARING Truck screw 3r.100" 5/16" O.D. brass 4. / 7/32"/%* J '»0 50•, 1 -471tri No· 43 drill TRUCK SPACER March 1954 LOCATION OF HOLES IN SADDLE 67 1 • Boiler screw • ACTUAL SIZE i.. 5 . 1, - .-1.0.... • ....... ... . 1/9/kirllill.#Ell.*gril 4/, 1./ : 75..Ill 1/4,/fil/1/62*/6 . " . ;. :.*..wgmpl'Ffwm#*5r•*,z:TB*"·,Ginajjk•fk036Al I'38•4:63:.-2:-·(,•;' . =• 1.,$231.Til:5*/7751•N//MP/**56** »11,1. 11 ..f«' '·•a :-,•#•-•LAIR.<•2••:•%•c'i-1 '•'i.. ..· , et# -4.-, lin Staff photos by Art Schmidt View of the completed mechanism. Neoprene tubing connects motor shaft with enclosed gear drive. ::.-> r,&24.<riw#".3--4,9,..•22:.....: ... /3 W '- A<*v,i.. Fig. 3